Hi Yucca,
I personally don't see why the interface's comments need to be changed. If you understand those comments, you would know what to do (how to implement). If you don't understand, then
you should post your worries.
Also Sun's given interface is just the "must implement" methods. Many other people feel that there are other "must" implement methods that should be included in the interface file. It is up to you where these other methods go.
Hope this helps.